Gamma Reference Voltage Correction for Dimming Grayscale
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Solution Overview
Problem
Display devices experience deterioration in display quality during dimming due to inadequate correction of gamma reference voltages, leading to loss of grayscale and reduced image quality.
Innovation Solution
A panel driving device and method that includes a controller, reference voltage generator, and data driver, which convert input image signals and dimming values into dimming control signals, correct gamma reference voltages, and generate gamma voltages to maintain grayscale representation across varying luminance levels, thereby reducing display quality deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If gamma reference voltages are not corrected during dimming, then power consumption is reduced, but display quality deteriorates and grayscale is lost
Solution Approach 1:
The patent changes the parameters of gamma reference voltages dynamically based on dimming levels. During dimming, the reference voltage generator adjusts the gamma reference voltages to appropriate levels, ensuring that grayscale representation is maintained across different luminance conditions while enabling power-saving dimming operation.
Solution Approach 2:
The patent applies preliminary correction to gamma reference voltages before displaying dimmed images. By pre-adjusting the reference voltages according to the dimming level, the system ensures that grayscale information is preserved from the outset, preventing grayscale loss that would occur without such preliminary correction.
2Manufacturing precision
If gamma reference voltages are corrected during dimming, then grayscale representation is maintained, but device complexity increases
Solution Approach 1:
The patent merges the gamma reference voltage correction function into the existing reference voltage generator that is already part of the display driving system. By integrating the correction capability within an existing component rather than adding a separate correction device, the patent maintains grayscale representation while minimizing increases in overall device complexity.
3Loss of energy
If dimming is applied without gamma voltage correction, then power consumption decreases, but image quality deteriorates
Solution Approach 1:
The patent dynamically changes gamma reference voltage parameters in response to dimming levels. When dimming is applied, the system adjusts the reference voltages to maintain appropriate voltage levels for grayscale representation, ensuring that image quality reliability is preserved even while operating at reduced power consumption levels.
Data Source
AI summary
Disclosed is a display device including a display panel. The device includes a reference voltage generator, a controller, and a data driver. The controller is configured to receive an input image signal and a dimming value, convert the dimming value into the dimming control signal, and convert the input image signal into image data. The reference voltage generator is configured to receive the dimming control signal and output a correction reference voltage by correcting at least one of a first gamma reference voltage and a second gamma reference voltage based on the dimming control signal. The data driver is configured to receive the correction reference voltage, generate gamma voltages based on the correction reference voltage, convert the image data into data voltages based on the gamma voltages, and output the data voltages to a display panel with pixels.